<template>
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item><span @click="goGoodsListPage">商品列表</span></el-breadcrumb-item>
      <el-breadcrumb-item>编辑商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="编辑商品信息"
        type="info"
        center
        :closable="false"
        show-icon
      >
      </el-alert>

      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 标签页区域 -->
      <el-form
        label-position="top"
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-tabs
          @tab-click="changeTag"
          :before-leave="beforeTabLeave"
          :tab-position="'left'"
          v-model="activeIndex"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
            >
              <el-input
                v-model="addForm.goods_price"
                type="number"
              > </el-input>
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
            >
              <el-input
                v-model="addForm.goods_weight"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
            >
              <el-input
                v-model="addForm.goods_number"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop="goods_cat"
            >
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>

          </el-tab-pane>

          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="item"
                  v-for="(item,i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>

          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              v-for="item in onlyTableData"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <el-upload
              :headers="headersObj"
              :on-success="handleUpload"
              action="https://lianghj.top:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
            >
              <el-button
                size="small"
                type="primary"
              >点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <el-button
              type="primary"
              style="margin-top:15px"
              @click="add"
            >添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览的对话框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewDialogVisible"
      width="50%"
    >
      <img
        :src="previewPath"
        alt=""
        class="previewImg"
      >
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 激活的步骤条的索引
      activeIndex: '0',
      // 表单的数据
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类的数组
        goods_cat: [],
        // 图片的临时路径
        pics: [],
        // 商品介绍
        goods_introduce: '',
        attrs: ''
      },
      // 表单的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请输入商品分类', trigger: 'blur' },
        ]
      },
      // 分类数据
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 图片上传的请求头
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片的预览路径
      previewPath: '',
      // 控制预览图片对话框的显示与隐藏
      previewDialogVisible: false,

    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类列表失败')
      this.cateList = res.data
      console.log(this.id);
    },
    // 点击相应面包屑触发
    goGoodsListPage () {
      this.$router.push('/goods')
    },
    // 级联选择框选中项变化触发
    handleChange () {
      // console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // tab标签页切换前触发
    beforeTabLeave (activeName, oldActiveName) {
      if (this.addForm.goods_cat.length !== 3 && oldActiveName === '0') {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // 切换tag标签页触发事件
    async changeTag () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.addForm.goods_cat[2]}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取商品参数失败')
        this.manyTableData = res.data
        // console.log('成功');
        console.log(this.manyTableData)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.addForm.goods_cat[2]}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取商品属性失败')
        this.onlyTableData = res.data
      }

    },
    // 预览图片时触发
    handlePreview (file) {
      // console.log(file)
      console.log(this.fileList)
      const u = 'http://localhost:8080/#/goods/add'
      this.previewPath = u + file.response.data.tmp_path
      this.previewDialogVisible = true
      // console.log(this.previewPath);


    },
    // 移除图片时触发
    handleRemove (file) {
      //  console.log(file);
      // 获取删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 获取这个图片的索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 在数组中删除这个图片的路径
      this.addForm.pics.splice(i, 1)
    },
    // 图片成功上传时触发
    handleUpload (response) {
      // 获得图片的临时路径
      const picInfo = response.data.tmp_path
      // 将路径添加到添加商品的参数中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm.pics);
    },
    // 点击添加按钮触发
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项！')

        // lodash cloneDeep(obj) 深拷贝
        // 此处直接给 addForm.goods_cat 添加 , 变成字符串会导致级联选择器出错
        // 所以需要深拷贝一份赋值给新的变量，后续直接使用新变量来进行操作
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);
        //  发起请求
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加成功')
        this.$router.push('/goods')
      }
      )
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0;
}
.previewImg {
  width: 100%;
}
</style>